Wiser for KNX and modbus problem

[Kilogica]

Read this: https://store.chipkin.com/articles/rs485...wire-rs485

Thank you, we knew most of this but it is surely helpful!

Indeed we tried to connect all of the GND connector to the 0V of the W4K, the question is: after we linked all the common conductors do we have to ground the wire or is already grounded from the W4K?

And beside that, we have two devices without a common connector, so we can't connect literally everything.

Thank you for your help.